is there a way to use 2 softwares at a time in Digi002r

can any one tell me...if there is a way to use 2 softwares at a time in Digi002r.....cuz i normally work on Sony Vegas5.0 and Sound Forge and cubase at a time and pro tools... too the thing is when i use another application it gives device busy...ok when i turn all the applications off then open the desired application again it gives the same error...anyone has a solution plz guide...